Thanks for the suggestions earlier this month regarding the SB-220. You may
recall that after
replacing a failed diode on the PC board, resting plate current was 0.3 amp
instead of 0.120. The
zener diode had indeed been blown. I replaced it with a string of 7 diodes
across a parallel .01
muF capacitor as suggested by Rich Measures. The amp tunes up fine now.
(Except for a bit of
intermittency of the grid current meter.)
John
w4kv
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